I have just installed Rachio 3. I also have a flow meter installed as well. I calibrated the zones and each of them are pretty high: 17.5 down to 11.5

Does the controller adjust water duration based on flow rate? When I set up a test schedule, it has it running for over an hour which means many thousands of gallons of water. I want to do things properly but I don’t want to have a second mortgage to pay the water bill.

Duration is calculated based on Nozzle Flow Inches per Hour. Since you’ve measured the flows (I assume they’re 11.5 to 17.5 gpm), if you can measure or approximate the area of each zone, you can calculate the flow by:

Flow GPM / Area (sq ft) x 96.25.

Example: 11.5 GPM with 2,000 square feet: 11.5 / 2000 x 96.25 = 0.55 "/hour.

If you measure the areas and calculate each zone’s flow rate, enter it into Advanced settings flow, that will calculate each zone’s watering time.

That is right, per the calculations. It’s a good bit of water in a relatively small area, so I’d say go with it. Make sure you check your other zones; they usually won’t be the same.

If you’ve selected your crop and soil properly, I’d say they’re normally pretty good. Sometimes recommended root depth can be off, IMHO. And Rchio just has no way of telling how much water your system gets per hour, so doing a simple calculation can really help.

Use the Rachio default value for your sprinkler head type (least accurate IMHO).

Use the head manufacturer’s specs for your heads, allowing for pressure and distance range.

Do a test using Catch Cups (time consuming and results VERY dependent upon cup location).

Calculate from GPM used and Area being applied to (best AVERAGE method, does not tell about high or low water areas).

I use #4. Using your water meter, measure how many gallons of water are used during a given period of time (Total gallons used divided by minutes on) and Area in square feet for the area being watered (can be measured, use Rachio app with version 3, use Google Maps add-in, etc.), then use the formula above to calculate Nozzle Flow Inches per Hour (Flow GPM / Area (sq ft) x 96.25).